Toro Groundsmaster 4300-D Service Manual page 152

Flushing the Hydraulic System (continued)
Hydraulic System: Service and Repairs
If a component failure occurs in the traction circuit; refer to the
Traction Circuit Component Failure (page 4–7)
regarding the importance of removing contamination from the
traction circuit.
1. Ensure that the hydraulic fluid is at normal operating temperature by
operating the machine for at least 20 minutes.
Before opening the hydraulic system, operate all the hydraulic
controls to release system pressure and avoid injury from the
pressurized hydraulic fluid; refer to
Hydraulic System (page
2. Park the machine on a level surface, lower the cutting decks, shut off the
engine, set the parking brake, and remove the key from the key switch.
Note: Ensure that you clean all the hydraulic connections that are
disconnected for draining.
3. Drain the hydraulic fluid from the hydraulic tank. Remove the tank cap,
screen filter, and clean the tank. Consider removing and cleaning the
reservoir if necessary.
4. Clean the area around the mounting areas of the hydraulic-fluid filters.
Remove and replace the hydraulic-fluid filters.
5. Inspect and clean the hydraulic tank; refer to
(page 4–97).
6. Drain the complete hydraulic system. Drain all the hoses, tubes, and
components while the system is warm. Flush the hoses and tubes to remove
any contamination.
7. Ensure that the mounting surfaces of the hydraulic-fluid filters are clean.
Apply clean hydraulic fluid to the gasket on new filters. Tighten the filters until
the gasket contacts the mounting plate, then tighten the filter 3 quarters
of a turn.
Using other hydraulic fluids could damage the hydraulic system.
Use the hydraulic fluids that are specified in the Operator's Manual.
8. Fill the hydraulic tank with the correct quantity of new hydraulic fluid.
9. Prime the hydraulic pumps; refer to
4–88).
10. Start the engine and operate it at low-idle speed (1,175 to 1,225 rpm) for
a minimum of 2 minutes. Increase the engine speed to high idle (3,005 to
3,055 rpm) for a minimum of 1 minute under no load.
11. Raise and lower the cutting decks several times. Turn the steering wheel fully
left and right several times.
IMPORTANT
CAUTION
Releasing Pressure from the
4–6).
IMPORTANT
Priming the Hydraulic Pumps (page
Page 4–90
for information
Inspecting the Hydraulic Tank
Groundsmaster
16226SL Rev C
® 4300-D